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Four new Planothidium species (Achnanthidiaceae, Bacillariophyceae) from the Karst region of Guizhou in China

by: Li, Yun; Lu, Lin-Xin; Zhou, Hui-Wen; Yu, Pan; Kociolek, John Patrick; Pang, Wan-Ting; Wang, Quan-Xi; You, Qing-Min

Publication date: 2025-6-25
Usage: Attribution 4.0 International
Topics: Diatoms, karst, monoraphid, new taxa, Planothidium, taxonomy
Publisher: Pensoft Publishers
Collection: biodiversity
Contributor: Pensoft Publishers
Language: English
Rights: https://biodiversitylibrary.org/permissions
Rights-holder: Copyright held by individual article author(s).
Volume: 259
Item Size: 29.0M

Abstract: Four new species of monoraphid diatoms belonging to the genus Planothidium were studied and described from the karst region of Guizhou Province, China. The morphological characteristics of these new species were observed and documented using light and scanning electron microscopy. Planothidium pseudoreichardtiisp. nov. exhibits a broad sinus at the central area on the interior of the rapheless valve, linear shallow depressions and a unique enlarged areola at the end of the striae on the exterior rapheless valve. Planothidium liboensissp. nov. is characterized by 4–5 rows striae on both valves, a cavum at the central area on the interior rapheless valve and irregular depressions on the exterior rapheless valve. Planothidium angustirostratumsp. nov. features elliptical valves with narrowly rostrate apices, a cavum at the central area of interior rapheless valve and circular depressions on the exterior rapheless valve. Planothidium maolanensissp. nov. has elliptical valves without protracted apices, coarsely-spaced striae on the one side of the central area of the both valves. These four new species were compared with other similar Planothidium taxa. In addition, ecological information was provided and the stability of some features was discussed.
Addeddate: 2025-07-16 14:58:28
Bhl_virtual_titleid: 210913
Bhl_virtual_volume: v.259 (2025)
Call number: 10_3897_phytokeys_259_150757
Call-number: 10_3897_phytokeys_259_150757
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Genre: article
Identifier: fournewplanothi259liyu
Identifier-ark: ark:/13960/s22p5rx66h0
Identifier-bib: 10_3897_phytokeys_259_150757
Identifier-doi: 10.3897/phytokeys.259.150757
Ocr: tesseract 5.3.0-6-g76ae
Ocr_detected_lang: en
Ocr_detected_lang_conf: 1.0000
Ocr_detected_script: Latin
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Pages: 22
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Possible copyright status: In copyright. Digitized with the permission of the rights holder.
Ppi: 300
Source: PhytoKeys 259
Year: 2025